NPI irons are also known as double-sided NPU irons. In addition to being used in the construction of buildings and workplaces and in the creation of all kinds of steel constructions, it also plays a major role in the construction of machinery and agricultural tools. The areas where it is used also increase the quality and durability.
| ANMA ADI | DIMENSIONS | BODY | CHEEK | WEIGHT |
| (hxb) | THICKNESS | THICKNESS | ||
| (mm.) | (mm.) | (mm.) | (mm.) | (Kg./Mt.) |
| 80 NPI | 80×42 | 3.90 | 5.90 | 5.950 |
| 100 NPI | 100×50 | 4.50 | 6.80 | 8.320 |
| 120 NPI | 120×58 | 5.10 | 7.70 | 11.200 |
| 140 NPI | 140×66 | 5.70 | 8.60 | 14.370 |
| 160 NPI | 160×74 | 6.30 | 9.50 | 17.900 |
| 180 NPI | 180×82 | 6.90 | 10.40 | 21.900 |
| 200 NPI | 200×90 | 7.50 | 11.30 | 26.300 |
| 220 NPI | 220×98 | 8.10 | 12.20 | 31.100 |
| 240 NPI | 240×106 | 8.70 | 13.10 | 36.200 |
| 260 NPI | 260×113 | 9.40 | 14.10 | 41.900 |
| 280 NPI | 280×119 | 10.10 | 15.20 | 48.000 |
| 300 NPI | 300×125 | 10.80 | 16.20 | 54.200 |
| 320 NPI | 320×131 | 11.50 | 17.30 | 61.100 |
| 340 NPI | 340×137 | 12.20 | 18.30 | 68.140 |
| 360 NPI | 360×143 | 13.00 | 19.50 | 76.200 |
| 380 NPI | 380×149 | 13.70 | 20.50 | 84.000 |
| 400 NPI | 400×155 | 14.40 | 21.60 | 92.600 |
| 425 NPI | 425×163 | 15.30 | 23.00 | 102.000 |
| 450 NPI | 450×170 | 14.20 | 24.30 | 115.000 |
| 475 NPI | 475×178 | 17.10 | 25.60 | 128.000 |
| 500 NPI | 500×185 | 18.00 | 27.00 | 141.000 |
| 550 NPI | 550×200 | 19.00 | 30.00 | 166.000 |
| 600 NPI | 600×215 | 21.60 | 32.40 | 199.000 |
